Multilayer procedure: the addition of a plastic film was step one to make brick containers impermeable to liquids and heat-sealable. While in the 1960s, an aluminum foil started to be extra for the cardboard container to ensure much better protection and extend the shelf lifetime of the packaged product or https://ecofriendlysustainablewaterpackaging.blogspot.com/2025/09/gable-top-milk-carton-icon-of-everyday.html